[TowerTalk] Feedline choke

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Hi folks,
Thank you all very much for your timely and helpful response to my =
query
concerning feedline choke for A3 beam. I received over twenty responses
to my somewhat na=EFve question. This reflector is indeed a valuable
resource !
Of course, Murphy had to play his part in my plans. Due to some =
domestic
duties, I was unable to actually raise the antenna. But I managed to
prepare all necessary cables, and indeed the coax coil is not as large
as I thought it will be, judging by Cushcraft drawings, so I expect no
adverse mechanical effects once attached to the boom.
In reply to my question whether the proximity to the metallic boom will
impair the electrical operation of the choke, several persons have
pointed that the electromagnetic field is located INSIDE the coax, so
the braid will effectively shield it from the boom. Right, of course;
but this raise another interesting question: at the =93symmetric=94 end =
of
the balun the current is circulating on the OUTSIDE of the braid, while
at the =93asymmetric=94 end the current is circulating on the INSIDE of =
the
braid. The electric field cannot penetrate the braid and therefore
cannot generate both currents. It seems to me that there must be a
certain current on BOTH the inside and the outside of the braid=85..
I accept as fact that from a practical point of view there will be no
adverse influence whatsoever in placing the choke in close proximity to
the metallic boom, and I will proceed with my installation work
accordingly. But I keep ponder this intriguing theoretical question, =
and
maybe someone will jump in with an explanation.
Again, thank you all for your support.
73 de Mike, YO3CTK
P.S. Please disregard the attachment, as it is an artifact of my
Microsoft software. Thanks.
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